Beef Wellington

Preheat oven to 425°F. Place sheet pan or cast iron skillet in oven and allow to heat as your oven warms.
In a small bowl create an egg wash by mixing 1 large egg yolk with 1 tablespoon milk or water
Remove wellingtons from the refrigerator and brush the top and sides of each puff pastry with the egg wash. Sprinkle kosher salt on top of each.
Carefully remove heated sheet pan or skillet from oven and lightly oil. Place wellington on pan. Bake in the upper-middle portion of the oven for approximately 15 to 20 minutes, or until the internal temperature of the steak reaches 125°F for medium-rare. The pastry should be golden brown on the surface.
If needed turn on broiler for minutes to get the pastry golden brown on top. Make sure to watch carefully, so it doesn’t burn.
Remove the wellingtons from the oven and allow to rest for at least 10 minutes before slicing.